Chuck for holding work-pieces.



G. WEBER.

CHUCK FOR HOLDING WORK PIECES.

APPucATloN man 001.3. 1914.

THE NORRIS'PETERS C0.. FHUTD-LITHO., WASHINGTON. D. C.

GUsTAv WEBER, or HAGEN, GERMANY.

CHUCK FOR HOLDING WORK-PIECES.

Specification of Letters Patent. l

Patented June 1, 1915.

Application filed October 3, 1914. Serial No. 864,777.

T0 all whom ttmai/ concern:

' Be it known that I, GUsTAv WEBER, engineer, a subject ofthe German Emperor, residing at Hagen, Westphalia., Germany, have invented certain new and useful Improvements in Chucks for Holding l/Vork- Pieces, of which the following is a specification.

This invention relates to a chuck which is particularly adapted for machines for making wood-screws and in which' the jaws are opened and closed by means of a revoluble bush or casing arranged co-axially about the axis of the chuck;

The essential feature ofthis invention is that, in order to o-pen or close the chuck, there is fitted a sliding piece, movable in the direction of its axis, which engages in two grooves in the spindles of the chuck and the casing respectively, Vsaid grooves being inclined one to another so that, by moving the sliding piece or actuating block lin the axial direction, the spindle of the chuck and the casing are rotated relatively one to the other and the jaws are thereby opened or closed. Consequently the opening orclosingof the chuck can lbe edected in a simple manner even with a high rateA of revolution. Further, the back ends of the jaws themselves may be advantageously connected by meansof aV ball joint to a bearing block whichgis adjustably fastened to the spindle of the chuck so that said jaws are capable of oscillation. Also, an ejecting rod and a second longitudinally adjustable tube or casing may be fitted in the spindle of the chuck, which tube, von being moved forward, separates the jaws for the purpose of releasing the piece of work, whereupon thelatter is ejected by means of the Y inner rod.

From the foregoing it will be seen that this invention Vhas in view three distinct actions in the ejecting operatiomirst the releasingof the jaws 6 by rotation ofthe cam pieces 18 and the jaws 6 in reverse directions; second, the opening of the jaws 6 by means of the tube 31 which engages and opens them on moving longitudinally forward; and finally, the positive ejecting or thrusting out of the work by rod or plunger 32 which vmoves longitudinally forward, these three operations taking place in the above order in very rapid succession.

One constructional form of the chuck is illustrated by way of example in the drawings, wherein Figure 1 is a longitudinal section, Fig. 2 is a plan, Fig. 3 is a front view of the head, the jaws being open, and Fig. 4 is a section on the'line A-A of Fig. 1.

Referring to the drawing, 1 is the hollow driving shaft of the machine which is journaled in the fixed bearings 2 and 3, and in the interior of which the actual spindle 4 of the chuck is situated. Said spindle 4 is also hollow, and carries at its front end a head 5 having jaws 6, which are held by means of a ball 7A in a bearingblock 8 and can thereby oscillate. Said bearing-block 8 is fixed to the head 5 of the chuck by means of a Screw 9 and is thus .adjustable or interchangeable. The free ends of the jaws are provided with projecting edges 10, by means of which they can grip and securely hold the head of the article to be worked l1,

for example, a wood-screw as shown in thel drawing. The opening and closing of the jaws is effected by means of a revolubly mounted bush or casing 15 which incloses thehead 5 of the chuck and is fitted to the front end of the driving shaft 1. The casing 15 Vis surrounded by a hood 17, which is attached by means of a screw 16, and carries internal cam or eccentric pieces 18 (Figs. l and 3), so that if it is rotated relatively to the head 5 of the chuck it actuates the jaws 6 by means of these cam or eccentric edges so as either to close them or set them free.

The rotation of the casing 15 is effected byturning the driving shaft 1 relatively to the spindle 4, To this end a bush 20, which is adjustable longitudinally and also revoluble between ball bearings 21, is fitted to the b ack end of the driving shaft 1, and the ends of the two spindles 1 and 4 are provided with obliqueV cross-grooves 22, 23, in which a common sliding-piece or actuating block 24, shaped in conformity with said grooves, engages and is rigidly connected with the bush 20. This sliding-piece or actuating block 24 rotates with the two spindles 1 and 4 and couples them together. A spring 25 in compression, which is supported against the fixed bearing 3, acts on the outer projecting edge ofthe bush 20 through the agency of a ball bearing 2l, and tends to hold the sliding-piece or actuating block 24 in the end position shown in Fig. 1, in which position the rotation of the head of the chuck 5 relative to the casing 15 is such that the jaws 6 are in the closed position. The ball bearing 21 fitted to the outer side of the bush 20 is actuated by a forked, swinging lever 30, so that on swinging this lever forward to the left the sliding piece or actuating block 24'is moved forward against the action of the spring 25 and, owing to the oblique guiding grooves 22, 23, the casing 15 is rotated relatively to the head of the chuck 5, and the jaws 6 are thereby freed for opening by the tube 31 and ejection of the workby rod 32, when a new piece of work may be inserted and the bushing 20 allowed to return to its normal position under the action of spring 25, the spindles l and 4being reversely rotated with relation to each other by piece or actuating block 24 until they assume their normal position and the jaws v6 are closed by the cams 18 on the new piece of work. Y

Inside the spindle 4 there is arranged another hollow shaft or casing 31, within which is fitted a longitudinally adjustable rod 32 for the purpose of ejecting the finished piece of work. The shaft 31, which is connected with a -rod 33, extending out of the spindle 4 and projecting at the back, is usually held in thel retracted position shown in Fig. 1 by means of a spring 34 fitted on the outside, while the ejecting rod 32 is held inthe advanced position toward the left by means of a spring 35 fitted inside the shaft 31 and is secured in this end position by a ycross-pin 37 which engages in a longitudinal slot 36. l j

The lever 30 which effects the opening of the chuck is provided with an additional arm 38, `which is situated opposite the projecting end 39 of the pin 33 so as to leave a certain amount of clearance. By means of this 'arrangement it is obtained, that on moving the lever 30 forward to the left the slidingpiece 24 is first pushed along the shaft and the `jaws of the chuck thereby f freed, and then, on further operating the lever 30, the additional arm 38 of which acts on the pin 33, the hollow shaft 31 is moved to the left against the action of the spring 34. Consequently the front edge of the shaft 31 forces the jaws of the chuck apart and the rod 32, owing to the action Vof the 1 spring 35 ejects the piece of work thus set free toward the front.

As. soon .as a. new piece of work is placed in the holder, the

lever 30, 38 is moved back to the position shown in Fig. 1l of the drawing, and consequently iirst the shaft 31 together with the ejecting` rod 32 returns and then the jaws" are closed bythe cam pieces 18, the spindles land 4 being rotated by the action of spring' 2 5 on bushing 20 and sliding piece or actuating-block 24. By this means the piece the work-piece, a tubular casing surround-1 ing said holder and provided withfclarnpV operating means which normally hold said clamps in their Vclosed position but/which release thev same when relative `rotation between said holder and casing occurs, said holder and casing being carried by concen-V trically mounted spindles provided with relatively oblique, longitudinal guides, Vand axially displaceable means engaging said guides for effecting said relative rotation.

2. In a chuck for holding `work-pieces suchv as wood screws,.the combinationof a work-piece holder comprising clamps for@ the work-piece, a tubular casing surround-7' V ing said holder and provided with clamp-V operating means which normally. hold said clamps in their closed position but which release the .same when relative rotationbetween said holder an'dcasing occurs, said holder and casingbeing carriedV by concenf trically mounted spindles provided with relatively oblique, longitudinal slots, and

axially displaceable means engaging said` slots for effecting said "relative rotation.V

3. In a` chunk for holding. work-pieces suchas wood-screws, the combination` of av work-piece holdercomprising clampsforgthe work-piece, a tubularfcasing surrounding said holder.. and provided Vwith, clamp-onf v erating means which .normallyjholdV said.

clampsv in their Vclosed position but which,

release the` same when relative rotation Vbetween l saidl holder and vcasing occurs, said` holder andcasing beingcarried by .concen-V trically mountedspindles provided; with 'Y relatively oblique, Vlongitudinal guides,V and axially Vdisplaceable, VVspring 'e controlled means engaging said Vguides Y' for 'eecting said relative rotation. .Y

V4.* In a chuck forfholding work-piecesV such as wood-screws, the combination of. a work-piece lholder `comprising' clamps for,V the work-piece, a tubularv casing surround' ing said holder andV provided with clamp# operating means which normallyhold said clamps in their closed position Ybut which" release the same when relative rotation between said holder andrcasing occurs, saidV holder andcasing being carriedby'concen-V i i trically mounted, spindles provided with relatively oblique, longitudinal slots, and a spring-controlled collar vaxially ydisplaceable on the spindles and having-an internal r sliding block engaging said'slots.V

5. In a chuck for holding work-pieces such as wood-screws, the combination cfa work-piece holder comprising,"Y clamps forV the work-piece, aA` tubular casing surrounding said holder and provided with clamp operating means which normally hold said clampsin their closed position but whichV release the same when relative rotation between said holder and lcasing occurssaid holder and casing being carried by concentrically mounted spindles provided' with relatively oblique, longitudinall slots, a collar axially displaceable on the spindles, a helicalspring coaxial with said spindles and ball-bearings located between said spring and'collar.

6. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising removable blocks which carry the clamps for the workpiece, a tubular casingsurrounding said holder and provided with clamp-operating means which normally hold said clamps in their closed position but which release the same when relative rotation between said holder and casing occurs, said holder and cas ing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and axially displaceable means engaging said guides for eiecting said relative rotation.

7. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising removable blocks ball-jointed to the clamps for the work-piece, a, tubular casing surrounding said holder and provided with clamp-operating means which normally hold said clamps in their closed position but which release the same when relative rotation between said holder and casing occurs, said holder and casing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and

axially displaceable means engaging said guides for effecting said relative rotation.

8. In a chuck for holding work-pieces such as wood-screws, the combination of a workpiece holder comprising clamps for the work-piece, a tubular casing surrounding said holder and provided vwith clamp-operating means which normally hold said clamps in their closed position but which release the saine when relative rotation be* tween said holder and casing occurs, said holder and casing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and Vaxially displaceable means engaging said guides for eiiecting said relative rotation;

and means for ejecting the work-piece after the release of said clamps.

9. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising clamps for the work-piece, a tubular casing surrounding said holder and provided with clampoperating means which normally hold said tween said holder and casing occurs, said holder and casing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and axially displaceable means engaging said guides for effecting said relative rotation; means for positively removing the clamps from the work-piece after their release, and means for ejecting the workpiece after removal of the clamps.

110. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising clamps for the work-piece, a tubular casing surrounding said holder and provided with clamp-operating means which normally hold said clamps in their closed position but which release the same when relative rotation between said holder and casing occurs, said holder and casing being carried by concen-` trically mounted spindles provided with relatively oblique, longitudinal guides, and axially displaceable means engaging said guides for effecting said relative rotation; and means comprising an axially displaceable rod mounted within the spindles for ejecting the work-piece after the release of said clamps.

11. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising clamps for the work-piece, a tubular casing surrounding said holder andv provided with clamp-operating means which normally hold said clamps in their closed position but which release the same when relative rotation between said holder and casing occurs, said holder and casing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and axially displaceable means engaging said guides for etl'ecting said relative rotation; means comprising an axially displaceable rod mounted within the spindles for removing the clamps from the work-piece after their release, and a second rod axially displaceable in the iirst rod for ejecting the released work-piece.

12. In a chuck for holding work-pieces such as wood-screws, the combination of a work-piece holder comprising clamps for the workpiece, a tubular casing surrounding said holder and provided with clamp-operating means which normally hold said clamps in their closed position but which release the same when relative rotation between said holder and casing occurs, said holder and casing being carried by concentrically mounted spindles provided with relatively oblique, longitudinal guides, and axially displaceable means engaging said guides for eiiecting said relative rotation; means for ejecting the workpiece after the release of -Y ingsaid holder'andprovided with clampoperating means which normally holdl said clamps in their closed position but which release'the same when relative rotation between said holder and casing occurs,V said holder and casing being carried by concentrically mounted spindles provided With relatively oblique, longitudinal guides, and

a axially displaceable means engaging said Copies of this patent may bey obtained for guides Yforeeeting saidrelative rotation-'g' coaXially mounted meansv for ejecting the Work-piece after the 'releaseof'said'clamps,Y Y and a lever having af rear extension, and l movable in the direction of theaxis of the spindles, saidlever in its movement driving the said axially displaceable means before.

the said extension drives the ejecting means.A In testimony whereof, I have signed my name to this speciicationin the presence of;

tWo subscribing Witnesses. Y .Y Y GUSTA-V [LQ Witnesses: i' di i HELEN NUFER, ALBERT NUFEnI vecents each, by addressing the Commissioner of Patents, Washington, D. G. K Y 

